Not really a fan of Phone sex..I would suggest having sex with her then you can have something to break the ice with when your trying to have phone sex like tell her what you wana do to her or some shit.
Just start off talking about your penis, if you have an erection or not, say a little about what you'd do to her if she were there with you, then ask her to continue.
Don't phonesex its for babies real adults get pussy phonesex is just funning around she might have a niggerdick in her ass while havin phonesex with you